[2.2c] Janna Guide - Utility Support Janna

Tailwind

• Janna passively gains bonus Movement Speed, and nearby allied champions gain this bonus when moving toward her. Additionally, Janna's basic attacks cause additional magic damage based on her bonus Movement Speed.

Try to stay in front of your team mates when walking to lane so that they return to lane faster. This passive also helps a lot with roaming to mid if your ad carry recalls and you have full health.

Howling Gale

• By creating a localized change in pressure and temperature, Janna is able to create a small storm that grows in size with time. She can activate the spell again to release the storm. On release this storm will fly towards the direction it was cast in, dealing damage and knocking away any enemies in its path.

A very powerful CC ability. Use it to poke or to interrupt enemies like Lee Sin's Sonic Wave / Resonating Strike or Jarvan's [Jarvan:3]+[Jarvan:1]. You can use it to knock-up enemies that are chasing you, or just flash in front of enemies and instantly use it to knock them up.

Zephyr

• Passive: Janna summons an air elemental that passively increases her Movement Speed and enables her to pass through units. 
• Active: Activate this ability to deal damage and slow an enemy's Movement Speed. The passive is lost while this ability is on cooldown.

Your bread & butter for poking. Use Zephyr and an auto attack to poke the enemy champions in lane. You can also use this ability to interrupt enemy casts like Bandage Toss .

Eye Of The Storm

• Janna conjures a defensive gale that shields an ally champion or turret from incoming damage and increases their Attack Damage.

This is your shield, which grants AD. Use it on the champion which will have most use of it. If you have a fed tryndamere, and a weak jhin then use it on the tryndamere rather than on jhin

Monsoon

• Janna surrounds herself in a magical storm, throwing enemies back. After the storm has settled, soothing winds heal nearby allies while the ability is active.

Very powerful heal with the scaling ap build. Also a very useful tool for disengaging or healing your allies near e.g. Baron.